I run supers out of a 10" barrel AR pistol, subs for grins sometimes. I have had zero issues with function but I'm using the Noveske KX3 which creates more backpressure. When I can afford it I'd like to get a suppressor for it, so please continue to post your findings, thanks!
BuffetDestroyer-What length is the barrel your using for your supersonic setup? I'm in the midst of a build that was going to be a 6.5 Grendel but at this point I don't feel like spending all the extra money (and have another caliber to reload) for bolt, mags, ammo, reloading stuff when I could have a rifle in 300 bl